/*
 * Copyright 2011,2012 Metamarkets Group Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.metamx.common.guava;

import com.google.common.base.Function;

/**
*/
public class MappingAccumulator<OutType, InType, MappedType> implements Accumulator<OutType, InType>
{
  private final Function<InType, MappedType> fn;
  private final Accumulator<OutType, MappedType> accumulator;

  public MappingAccumulator(
      Function<InType, MappedType> fn,
      Accumulator<OutType, MappedType> accumulator
  ) {
    this.fn = fn;
    this.accumulator = accumulator;
  }

  @Override
  public OutType accumulate(OutType accumulated, InType in)
  {
    return accumulator.accumulate(accumulated, fn.apply(in));
  }
}
